An interactive applet and associated web page showing how to find the area and perimeter of a trapezoid
from the coordinates of its vertices. The trapezoid can be either parallel to the axes or rotated.

The grid and coordinates can be turned on and off.
The area and perimeter calculation can be turned off to permit class exercises and then turned back on the verify the answers.
The applet can be printed as it appears on the screen to make handouts.

The web page has a full description of the method for determining area and perimeter, a worked example and
has links to other pages relating to coordinate geometry.

Applet can be enlarged to full screen size for use with a classroom projector.
After use in the classroom, student can access it again from any web browser at home or in the library with no login required.

This material is based upon work supported by the
National Science Foundation under Grant DUE-0226284.
Any opinions, findings, and conclusions or recommendations
expressed in this material are those of the author(s)
and do not necessarily reflect the views of the
National Science Foundation.